28 Cancri
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 6.05[3] |
| Characteristics | |
| Spectral type | F0 Vn[4] |
| U−B Template:Engvar | +0.13[3] |
| B−V Template:Engvar | +0.22[3] |
| Variable type | δ Sct[5] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[6] km/s |
| Proper motion (μ) | RA: −30.946[2] mas/yr Dec.: −39.719[2] mas/yr |
| Parallax (π) | 8.4885±0.1539 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.41[7] |
| Details | |
| Mass | Script error: No such module "val".[8] Template:Solar mass |
| Radius | 3.7[2] Template:Solar radius |
| Luminosity | 44[2] Template:Solar luminosity |
| Surface gravity (log g) | 3.61[2] cgs |
| Temperature | Script error: No such module "val".[8] K |
| Metallicity [Fe/H] | +0.16[9] dex |
| Rotational velocity (v sin i) | 133[8] km/s |
| Age | 737[2] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
28 Cancri is a star system in the zodiac constellation of Cancer. It is a variable star with the designation CX Cancri, and is close to the lower limit of visibility with the naked eye, having a mean apparent visual magnitude of 6.05.[3] The annual parallax shift seen from Earth's orbit is Script error: No such module "val"., which provides a distance estimate of about 384 light years. It is moving away from the Sun with a radial velocity of around +9 km/s.[6]
Based upon proper motion variation, this is an astrometric binary system with high likelihood (99.8%).[11] The visible component has a stellar classification of F0 Vn,[4] indicating it is a F-type main-sequence star with "nebulous" lines due to rapid rotation.
In 1973, John R Percy announced that 28 Cancri might be a variable star.[12] Stephen John Horan et al. confirmed that the star's brightness varies, in 1974.[13] In 1979, it was given its variable star designation.[14] It is a Delta Scuti variable star with a period of 0.0960 days and an amplitude of 0.020 in magnitude.[15] With 2.4 times the mass of the Sun it is spinning with a high projected rotational velocity of 133 km/s. 28 Cancri is radiating roughly 44 times the Sun's luminosity from its photosphere at an effective temperature of around 7,516 K.
References
<templatestyles src="Reflist/styles.css" />
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d e f g h i Template:Cite Gaia DR3
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".